Abstract: A method for separating sodium and potassium from an aqueous solution containing such metals, which comprises selectively ion-exchanging sodium and potassium with titania hydrate (TiO.sub.2 .multidot.nH.sub.2 O where n=1 to 2) obtained by treating potassium titanate to remove potassium therefrom, followed by a reaction at a temperature of from 25.degree. to 80.degree. C. to desorb and purify sodium and potassium.

Abstract: A device for compensating for nonlinearity of amplifiers by use of a predistortion principle, and a nonlinear signal generating circuit built in such a device. The nonlinear signal generating circuit includes a quadrature hybrid of the type using a distributed constant line. Two diodes and a terminal resistor are connected in parallel and opposite in polarity to each other and connected between the terminals of coupling and passing ports of the hybrid and ground. The nonlinear compensating device is constituted by the combination of a plurality of quadrature hybrids of the type using a distributed constant line and various kinds of diodes. All the circuit segments of the device are implemented with a planar circuit provided on a single dielectric substrate and diodes which are held in a pair chip condition. Such circuitry is accommodated in a single air-tight housing to complete a microwave integrated circuit.

Abstract: A tetragonal system tunnel-structured compound having the formula:A.sub.x [Ga.sub.8 M.sub.y Ga.sub.(8+x)-y Ti.sub.16-x O.sub.56 ](I)wherein A is at least one alkali metal selected from the group consisting of K, Rb and Cs, or a solid solution of such alkali metal with lithium, sodium or barium, M is at least one trivalent metal selected from the group consisting of Al, Fe and Cr, x is a number of from 0.1 to 2.0, and y is a number of from 0 to 10.

Abstract: A process for producing potassium hexatitanate fibers having a tunnel structure, which comprises mixing a titanium component represented by the general formula (Ti, M)O.sub.2 where M is metal impurities with a potassium component selected from the group consisting of potassium oxide, potassium compounds capable of forming potassium oxide when heated and a mixture thereof, to obtain a mixture represented by the general formula K.sub.2 O.n(Ti, N)O.sub.2 where n is from 1.5 to 2.5 and M is as defined above; heating the mixture to obtain a melt; forming from the melt a fibrous material having a layered crystalline structure corresponding to potassium dititanate (K.sub.2 O.2TiO.sub.2); leaching a part of K.sub.2 O from the fibrous material; and heating the fibrous material at a temperature of at least 800.degree. C. and lower than the melting point of the fibrous material.

Abstract: Fibrous potassium titanate comprises heating to a temperature of 950.degree. C. to 1300.degree. C. potassium titanate of the general formula K.sub.2 O.nTiO.sub.2 in which n is from 3 to 5, or a mixture of materials from which potassium titanate is formed, to form is manufactured by decomposition a solid phase of potassium hexatitanate and a liquid phase of potassium titanate of the general formula K.sub.2 O.nTiO.sub.2 (2.ltoreq.n.ltoreq.3), cooling said potassium hexatitanate and potassium titanate slowly to a temperature of 900.degree. C. to 950.degree. C., and controlling the rate of said cooling to cause a bonding of said potassium hexatitanate and said potassium titanate to form a solid phase of potassium tetratitanate fibers, whereby potassium titanate according to said general formula in which n is from 4 to 6 is caused to grow in single crystal form.

Abstract: A crystalline fibrous potassium titanate having the formula K.sub.2 O.6TiO.sub.2 is produced by melting a mixture of a titanium component and a potassium component; quenching the molten product on a plate; removing the unreacted K.sub.2 O and excess K.sub.2 O from the quenched product by washing water or an acid; and heat-treating the product to improve crystallinity.

Abstract: Fibrous alkali metal titanate is prepared by mixing 5-50 mole % of an alkali metal titanate or an alkali metal titanate forming components with a flux of an alkali tungstate or molybdate, and heating the mixture at 700.degree.-1,350.degree. C to grow the fibrous product in the molten flux mixture.